cortisol and glucose

Definition of Glucocorticoids: A class of steroid hormones produced in the adrenal cortex. They are vital in regulating metabolism and immune responses.
Cortisol: The most well-known glucocorticoid, often referred to as the stress hormone, plays crucial roles in various bodily functions.

Function of Cortisol: Increases blood glucose levels during stress or increased physical activity.
- Mechanism: Cortisol mobilizes fats and proteins but does not influence carbohydrate metabolism directly.
- Liver's Role: The liver serves as a storage organ for macronutrients like proteins, lipids, and carbohydrates. The release of carbohydrates is primarily regulated by insulin, not glucocorticoids.
Insulin and Carbohydrates: Insulin facilitates the uptake and mobilization of glucose from liver stores, which is critical during times of energy demand due to physical activity.

Mobilization of Non-Carbohydrate Sources:
- Cortisol increases the availability of proteins and fats for energy production during stress. This mobilization results in increased energy availability to support increased physiological demands.
- Metabolism of Lipids and Proteins: Highlighted as crucial non-carbohydrate sources of energy during stress.
Anti-Inflammatory Effects of Cortisol:
- Acts as an immunosuppressant, reducing inflammation by inhibiting the immune response.

Definition and Function of Mineralocorticoids: Hormones that regulate mineral metabolism, particularly sodium and potassium.
- Role of Renal System: Mineralocorticoids, such as aldosterone, influence renal absorption and excretion of sodium and potassium, which in turn affects fluid retention.
- Osmotic Principles: Changes in sodium levels directly impact water retention due to osmotic gradients, leading to changes in blood volume and blood pressure.
Blood Pressure Regulation:
- Increased sodium retention leads to increased blood volume, which raises blood pressure.
- To reduce hypertension, aldosterone antagonists may be administered, blocking sodium retention and promoting water elimination.

Adrenal Medulla Function: Acts as a link between the nervous system and the endocrine system, secreting stress hormones like adrenaline and noradrenaline.
Stress Definition: A physiological response to perceived threats, which can arise from various situations including danger or illness.
Stress Hormone Secretion:
- Upon perception of a stressor, adrenaline and noradrenaline are produced and secreted, initiating a fight or flight response.
Fight or Flight Reaction:
- Involves physiological responses such as increased heart rate, elevated blood pressure, and expanded airway passages to enhance oxygen intake and energy availability.

Sympathetic vs. Parasympathetic Nervous System: The sympathetic system mobilizes the body's resources under stress, while the parasympathetic system promotes rest and recovery.
Neurotransmitters in Stress Response: Adrenaline is the primary neurotransmitter facilitating the fight or flight response.
Independent Action of Adrenal Glands: The adrenal glands function without direct influence from the pituitary gland during stress responses.

Definition: The body’s adaptive response to stressors through several stages: alarm, resistance, and exhaustion.
Physiological Changes During Stress:
- Increased heartbeat and blood sugar levels due to lipolysis (breakdown of fats) for energy.
- Activation of adrenal hormones contributes positively to energy mobilization during stressful events.

Beta-Endorphins: Produced by ependymal cells in the third ventricle of the brain, these play a critical role in pain suppression during stress responses.

Uterine Preparation for Pregnancy: Uterine mucosa thickens and receives more blood vessels in anticipation of fertilization.
- Ovulation: Occurs around day 14 of the menstrual cycle with the release of the ovum from the follicle.
Corpus Luteum Formation: Following ovulation, if fertilization occurs, the follicle transforms into a corpus luteum, essential for maintaining pregnancy.
Female Hormones in Menstrual Cycle:
- Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) regulate ovarian follicle maturation, leading to the menstrual cycle progression and preparation for pregnancy.
- Their action is governed by a negative feedback mechanism to prevent additional ovulations during existing pregnancies.